Please note this is a region B Blu-ray and will require a region B or region free Blu-ray player in order to play.All episodes from the first nine seasons of the US sitcom. The series revolves around two university physicists, Leonard (Johnny Galecki) and Sheldon (Jim Parsons), their beautiful, free-spirited neighbour, Penny (Kaley Cuoco-Sweeting), and their friends, Howard (Simon Helberg) and Rajesh (Kunal Nayyar).